1 definition
by
Imnotbotting1980

The process or act in which the labia of the woman's vagina gets caught due to friction from the insertion of a member or object, and is pulled partially or completely inside the vaginal canal causing discomfort and or pain. (usu. due to a lack of lubrication)

my girlfriend complained that I didnt use enough lubrication and suffered from intermittent vaginal-undertoe.